One interval where the graphs concave upwards, and one where it is concave downwards

Where is the function Concave Up and Down?

Hi im trying to find one interval where the function is concave up and one interval where it is concave down. The function is: f(x)=(x+5)/(x^2-16). Heres my information. What points do i use from my notes?

would it be between the inflection point and -4 asymptote (theres a inflextion)?
Asymptotoes are x=4 x=-4